µTorrent 1.9 build 13485 alpha

What is in 1.9:
uTP, the micro transport protocol. This UDP-based reliable transport is designed
to minimize latency, but still maximize bandwidth when the latency is not
excessive. We use this for communication between peers instead of TCP, if both
sides support it. In addition, we use information from this transport, if
active, to control the transfer rate of TCP connections. This means uTorrent,
when using uTP, should not kill your net connection - even if you do not set any
rate limits.

What was in 1.8.1:
uTP, but connection attempts were not initiated by default, and there was no
control over TCP as described above. You can enable it, but likely you will see
the uTP connections not transfering much data, because they are pushed out of
the way by TCP.

What this means for rate control:
You are still free to set rate limits and use external limiters. The "Automatic
upload rate" control is flawed enough for most people that it will likely be
removed once uTP is well tested and deployed, since it entirely supercedes that
feature.